1231321122 has 64 divisors (see below), whose sum is σ = 2815637760. Its totient is φ = 398691072.

The previous prime is 1231321103. The next prime is 1231321129. The reversal of 1231321122 is 2211231321.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1231321095 and 1231321104.

It is not an unprimeable number, because it can be changed into a prime (1231321129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 292698 + ... + 296874.

It is an arithmetic number, because the mean of its divisors is an integer number (43994340).

Almost surely, 2^1231321122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231321122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1407818880).

1231321122 is an abundant number, since it is smaller than the sum of its proper divisors (1584316638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231321122 is a wasteful number, since it uses less digits than its factorization.

1231321122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4344 (or 4338 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1231321122 is about 35090.1855509486. The cubic root of 1231321122 is about 1071.8247380229.

Adding to 1231321122 its reverse (2211231321), we get a palindrome (3442552443).

The spelling of 1231321122 in words is "one billion, two hundred thirty-one million, three hundred twenty-one thousand, one hundred twenty-two".